Electric secondary clock



P. P. ANDERSEN.

ELECTRIC SECONDARY CLOCK.

APPLICATION FILED APR. 2,1919.

Patented Mar. 30, 1920.

19 2 /s n 3 7 3 /0 /7 W 4' 6:: Q o g F nv W131;

5w veniw" PA. NT PETS.

POUL PETER ANDERSEN, 0F TAASTRUP, DENMARK.

ELECTRIC SEGGNDARY GLO Specification of Letters Patent.

Patented Mar. 30, 1920.

Original application filed January 23, 1918, Serial No. 213,339. Divided and this application filed April 2,

To all whom 2'25 may concern Be it known that 1, Poor. Pn'rnn ANDER- SEN, citizen of the Kingdom of Denmark, residing at T aastrup, Denmark, have invented certain new and useful Improvements in Electric Secondary Clocks, of which the following is a specification.

The present invention is an arrangement in electric secondary clocks driven by an electro-magnet, whose circuit is closed and broken periodically by a mechanical or electrical master clock, and its distinguishing feature is that the electro-magnet armature, during its attraction or its return from the attracted position, turns a double-armed lever, whereby one arm of the lever supporting one or more pawls forces the driving wheel of the secondary clock a certain slight piece forward, for instance -1 of a revolution, while a counterweight on the other arm of the lever brings the lever and, thereby, the pawls back, when the lever is released by the electro-magnet armature. The invention herein claimed is a division of my prior application Serial No. 213,339, filed January 23, 1918.

The invention is further distinguished by the arrangement of a lever by means of which the above mentioned two-armed lever may be turned by hand, whereby all the pawls cooperating with the driving wheel are withdrawn from the said wheel, which may then be turned at will, for instance when the clock is to be adjusted.

The drawing shows one manner of constructing the secondary clock, in front elevation and with the casing and dial removed.

1 is the minute-wheel of the secondary clock, 2 its hour-wheel, the shafts of these wheels being co-axial and coupled together, in known manner, by means of a gear transmission 3, 4 located between the wheels. All the gear-wheel shafts are journaled, in man ner known per 86, in a frame 5.

The shaft of the minute-wheel carries the large clock-hand 6 and a counter-weight 7 for the same shown in dotted lines, as well as a ratchetavheel 8, which is the driving wheel of the clock and cooperates with a pawl 9. The latter is journaled at the end of one arm 10 of a double-armed lever 10, 11 whose pivot pin '12 rests in suitable bearings 13 on the frame 5, and whose other arm 11 supports a counter-weight let tendmg to force this arm downward. Instead of this Serial No. 287,004.

counter-weight, there may, of course, be used a helical spring, a flat spring or a simi lar known loading member.

15 is an electro-magnet, 16 its armature supporting a rod 17 resting against the top side of the lever 10, when the electro-magnet armature is not attracted.

The secondary clock is driven by a not shown electric circuit passing the spools of the electromagnet 15 and being closed periodically, for instance every minute, by a mechanical or electrical master clock containing, in known manner, a circuit-closer of suitable known kind, driven by the clock and acting periodically. When the secondary clock is used in connection with an electric master clock, this circuit-closer may be the same as the one closing the circuit passing the impulse-magnet of the master clock. If the secondary clock is built together with the master clock, the impulse-magnet of the latter and the driving magnet of the secondary clock may furthermore, be one and the same magnet.

The secondary clock is driven in the following manner:

When the circuit is closed by way of the electro-magnet 15, the latter attracts its armature 16 and lifts, thereby, the rod 17 clear of the lever arm 10. Simultaneously, the counterweight 1 1 turns this lever arm upward, whereby the pawl 9 is raised and slides up on top of the teeth of the ratchet wheel 8. lVhen the magnet, immediately thereafter, releases its armature, the latter will fall and, thereby, push the rod 17 against the top side of the arm 10, whereby the latter and, thereby, the pawl 9 are forced downward, so that the pawl turns the wheel 8 forward. If the wheel 8 has teeth, this angular motion should equal the pitch because, as the wheel 8 is fixed on the shaft for the minute wheel, the motion must be r of a full revolution, that is 6. In order to secure this, there is fastened to the end of the arm 10, besides the pivoted pawl 9, a pawl 18 rigidly connected to the arm. During the downward motion of the lever arm 10, this pawl 18 is moved into the space between two teeth of the wheel 8, and stops the motion of the latter as well as of the arm 10, when the wheel has moved one tooth forward.

19 is a fixed check-pawl preventing the wheel 8 from turning backward.

About a pin 20 on the frame 5, there is pivoted a double-armed lever 21, 22 whose one arm 21 engages the lever arm by means of a fork 23, wnile its other arm 22 may be actuated from the outside, for instance by hand, whereby the lever 21, 22

may be moved, so that the arm 21 is moved up against the arm 10 and raises the latter.

pawls 9 and 18 are thereby lifted clear the wheel 8. The check-pawl 19 is fitted ;h a tongue 24: projecting out above the pawl 18 without touching it, however, and without preventing its free motion, while the secondary clock is going, but being actuated by the pawl 18, when the latter is lifted by means of the lever 21, 22, so that the check-pawl is lifted clear of the wheel b. iihe latter being thereby released there is nothin to revent it from bein turned b hand, whereby the secondary clock may be a dj usted.

in the construction shown, the clockineehanism is driven by the electro-magnet armature every time the latter falls. in- .aead, the electro-magnet armature may, of course, be made to move the driving wheel 8 forward everytime it is attracted. It is also unnecessary for the driving wheel 8 to be fixed on the shaft of the minute-hand, it may, of course, drive this shaft and the other shafts of the mechanism through any suitable spur gear system. Instead of engaging the driving wheel 8, the check-pawl l9 may engage a separate ratchet wheel fas- 0b,, tened on the shaft of the driving wheel.

Having now particularly described and ascertained the nature of my said invention a d in what manner the same is to be perfermed, I declare that what I claim is 1. In an electric secondary clock, the combination of an electro-magnet whose circuit is periodically closed; an armature therefor; a driving wheel; an actuating lever disposed adjacent said armature and provided with a driving pawl for engagement with said wheel; means operatively related to said lever for automatically moving it in a direction to disengage said pawl when the magnet is energized and attracts its armature; and means associated with said arma ture for rocking said lever in a direction to engage said pawl with said wheel and thereby rotate the latter when the armature returns to normal position consequent upon deenergization of the magnet.

2. In an electric secondary clock, the combination, with an e ectro-magnet whose circuit is periodically closed, and a driving wheel; of an actuating lever pivoted intermediate its ends and provided at one end with a driving pawl for engagement with said wheel; a pivotally-mounted armature interposed between said magnet and said lever; and means connected with the other 6-5 end of said lever for automatically depressfor limiting ing that end and raising the first-named end to disengage said pawl when said magnet is energized and attracts its armature; said armature dropping by gravity when the magnet is deenergized and eXerting its weight upon the raised end of the lever so as to depress said end and thereby cause the pawl to engage and turn said wheel.

3. In an electric secondary clock, the combination of an electro-magnet whose circuit is periodically closed; an armature therefor; a driving wheel; an actuating lever disposed adjacent said armature and provided with a driving pawl for engagement with said wheel; means operatively related to said lever for automatically moving it in a direction to disengage said pawl when the magnet is energized and attracts its armature; means associated with said armature for locking said lever in a direction to engage said pawl with said wheel and thereby rotate the latter when the armature returns to normal position consequent upon deenergization of the magnet; and stopping means for automatically limiting the rotary movement of said wheel by said pawl.

4:. In an electric secondary clock, the com bination of an electro-magnet whose circuit is periodically closed; an armature therefor; a driving wheel; an actuating lever disposed ad acent said armature and provided with a driving pawl for engagement with said wheel; means operatively related to said lever for automatically moving it in a direction to disengage said pawl when the magnet is energized and attracts its armature; means associated with said armature for rocking said lever in a direction to engage said pawl with said wheel and thereby rotate the latter when the armature returns to normal position consequent upon deenergization of the magnet; and stopping means engageable with said wheel during the re turn movement of the armature to limit its rotation by said pawl, but released therefrom consequent upon the attraction of the armature.

5. In an electric secondary clock, the combination, with an electro-magnet whose circuit is periodically closed, and a driving wheel; of an actuating lever pivotally mounted intermediate its ends adjacent said magnet; an armature for said magnet intcrposed between said lever and said magnet;

a pair of pawls connected to one end of said lever for engagement with said. wheel, one pawl for rotating the wheel and the other the extent of. its rotation; said armature having means for rocking said lever in one direction to cflect the engagement of said pawls with said wheel during the movement of the armature in one direction with relation to the magnet; and means connected to the other end of the lever for rocking it in the opposite direction so as to disengage said pawls consequent upon the movement of said armature in the opposite direction.

6. In an electric secondary clock, the combination, with an electro-magnet whose circuit is periodically closed, an armature therefor, and a driving wheel; of an actuating lever pivoted intermediate its ends adjacent the magnet and provided at one end with a driving pawl for engagement with said wheel to turn the same; a back check pawl normally engaged with said wheel; means operable consequent upon the movement of the armature in one direction with relation to the magnet to rock said lever in a direction to effect the driving engagement of the driving pawl with said wheel; means operable consequent upon the movement of the armature in the opposite direction to rock said lever in a direction to disengage the driving pawl; and means for automatically disengagin the back check pawl simultaneously with the disengagement of the driving pawl.

7. In an electric secondary clock, the combination, with an electro-magnet whose circuit is periodically closed, an armature therefor, and a driving wheel; of an actuating lever pivoted intermediate its ends adjacent the magnet and provided at one end with a driving pawl for engagement with said wheel to turn the same; a back check pawl normally engaged with said wheel; means operable consequent upon the move ment of the armature in one direction with relation to the magnet to rock said lever in a direction to effect the driving engagement of the driving pawl with said wheel; means operable consequent upon the movement of the armature in the opposite direction to rock said lever in a direction to disengage the driving pawl; and an extension on the back check pawl for operation by said lever to disengage that pawl simultaneously with the disengagement of the driving pawl.

8. In an electric secondary clock, the combination, with an electro-magnet whose circuit is periodically closed, and a driving wheel; of an actuating lever pivotally mounted intermediate its ends adjacent said magnet; an armature for said magnet interposed between said lever and said magnet; a pair of pawls connected to one end of said lever for engagement with said wheel, one pawl for rotating the wheel and the other for limiting the extent of its rotation; said armature having means for rocking said lever in one direction to effect the engagement of said pawls with said wheel during the movement of the armature in one direction with relation to the magnet; means connected to the other end of the lever for rocking it in the opposite direction consequent upon the movement of the armature in the opposite direction; a back check pawl normally engaged with said wheel; and means for automatically disengaging the back check pawl simultaneously with the disengagement of the first-named pawls.

9. In an electric secondary clock, the combination, with an electro-magnet whose circuit is periodically closed, and a driving wheel; of an actuating lever pivotally mounted intermediate its ends adjacent said magnet; an armature for said magnet interposed between said lever and said magnet; a pair of pawls connected to one end of said lever for engagement with said. wheel, one pawl for rotating the wheel and the other for limiting the extent of its rotation; said armature having means for rocking said lever in one direction to eitect the engagement of said pawls with said wheel during the movement of the armature in one direction with relation to the magnet; means connected to the other end of the lever for rocking it in the opposite direction consequent upon the movement of the armature in the opposite direction; a back check pawl normally engaged with said wheel; and means operated by one of the first-named pawls during its disengagement for simultaneously disengaging the back check pawl.

10. In an electric secondary clock, the combination with an electro-magnet, an armature theretor, and a driving wheel; of an actuating lever provided at one end with a pawl for engagement with said wheel to turn the same; means whereby said lever is automatically rocked in a direction to eifect the driving engagement of said pawl with said wheel consequent upon the movement of the armature in one direction with relation to the magnet; means connected with the other end of said lever for automatically rocking it in a direction to release said pawl consequent upon the movement of the armature in the opposite direction; and a device, operable by hand, connected with said lever for actuating it at will to release said pawl.

11. In an electric secondary clock, the combination with an electro-magnet, an armature therefor, and a driving wheel; of an actuating lever provided at one end with a pawl for engagement with said wheel to turn the same; means whereby said lever is automatically rocked in a direction to effect the driving engagement of said pawl with said wheel consequent upon the movement of the armature in one direction with relation to the magnet; means connected with the other end of said lever for automatically rocking it in a direction to release said pawl consequent upon the movement of the armature in the opposite direction; and a two-armed lever having one arm connected with the first-named lever and the other arm terminating in a finger piece, whereby it will to rock gravity when the magnet is denergized and exerting its weight upon the raised end of said lever so as to depress said end and thereby cause the pawl to engage and turn said wheel; and a hand-operated device connected to said lever to rock the same at will in a direction to disengage said pawl from said wheel.

In testimony whereof the foregoing specification is signed in the presence of two witnesses.

POUL PETER ANDERSEN.

Witnesses JULIUS LEHMANN, CARL HEMMINGSEN. 

